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Cut Warmatec Heating Mat: Bathroom Renovation, 340W to 150W, Connecting Safely, 155.5 Ohms Resistor

topolskia 9198 11
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Can I safely reconnect a cut bathroom heating mat by adding a resistor?

You should not connect the cut heating mat directly, because shortening a heating mat lowers its resistance and increases current and power, so it can overheat or fail [#16611952][#16611953] The forum warns that if the resistance is too low there can be a “boom,” and in a bathroom there is also a shock risk if the cut end is not properly insulated [#16611953] One reply says a series resistor is theoretically possible, but without exact data on the shortened mat and its insulation it is probably not feasible [#16611997] Another reply estimates that after the mat was cut by about 50%, a 150–200 W resistor would be needed, but immediately advises to forget that idea and not proceed [#16612002] The only real rescue suggested is to remove the tiles and reinstall the mat properly at the specialist’s expense [#16611953][#16612492]
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  • Heating mat cut to about 150 W remaining

    #1 16611935
    topolskia
    Level 10  
    Posts: 8
    Hello
    When renovating the bathroom, a "specialist" cut my heating mat and put it on the already cut tile, so there is no rescue, but I have a question how to get out of this problem with what is under the floor, a resistor? etc gives the data:
    MATA 340 W 155.5 OHMA
    my calculations show that after cutting the floor about 150 W is left, is it possible now to connect it so as not to burn the mat?

    please help
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  • #2 16611952
    kokapetyl
    Level 43  
    Posts: 13445
    Help: 1787
    Rate: 2102
    topolskia wrote:
    my calculations show that after cutting, about 150 W remained in the floor

    How did you calculate it?
    Cutting the heating mat reduces its resistance, and therefore increases its power.
    What is the resistance of this mat, nothing is known without it.
    Heating mats must not be shortened.
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  • Resistance and insulation concerns for cut heating mat

    #3 16611953
    kkas12
    Level 43  
    Posts: 17402
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    It is not about the power of the mat, but about its resistance. If it is too low, there will be a BOOM.
    Or rather, it will definitely be too low.

    Moreover, what about its insulation? There is a risk of an electric shock in the bathroom.
    Is it a double-sided or one-sided feeding mat?
    And 150W is (I think) assumed for 1m2 in the case of tiled floors.

    There is rescue.
    Forging tiles and laying new ones together with the mat at the expense of a specialist.
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  • Resistance and insulation matter more than wattage

    #4 16611960
    topolskia
    Level 10  
    Posts: 8
    kkas12 wrote:
    It is not about the power of the mat, but about its resistance. If it is too low, there will be a BOOM.
    Or rather, it will definitely be too low.

    Moreover, what about its insulation? There is a risk of an electric shock in the bathroom.
    Is it a double-sided or one-sided feeding mat?
    And 150W is (I think) assumed for 1m2 in the case of tiled floors.

    There is rescue.
    Forging tiles and laying new ones together with the mat at the expense of a specialist.

    unilaterally, that is, there is no rescue :(
    yes, the mat is now about 1m2
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  • #5 16611977
    kokapetyl
    Level 43  
    Posts: 13445
    Help: 1787
    Rate: 2102
    topolskia wrote:
    the mat is now about 1m2

    So what are we supposed to answer?
    You don't provide any specific information.
    It has already been said that they must not be shortened.
  • #6 16611981
    topolskia
    Level 10  
    Posts: 8
    kokapetyl wrote:
    topolskia wrote:
    the mat is now about 1m2

    So what are we supposed to answer?
    You don't provide any specific information.
    It has already been said that they must not be shortened.


    I know you can't, the question was whether you can put a resistor so that this piece does not explode
    how does it not report?
    mat 4mx0.5m 340 W, after cutting it is 1.7x0.5 and that's it :(
  • #7 16611997
    kokapetyl
    Level 43  
    Posts: 13445
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    Rate: 2102
    topolskia wrote:
    the question was

    Which post was it in? Somehow I do not see this question.
    Without precise information, it is impossible to say, we do not know how much this mat has been shortened, what its residual resistance has been, and how it has been insulated (cut-off point). The use of a resistor is theoretically possible, but probably not feasible.

  • Resistor unlikely to safely prevent mat overheating

    #8 16612000
    topolskia
    Level 10  
    Posts: 8
    kokapetyl wrote:
    topolskia wrote:
    the question was

    Which post was it in? Somehow I do not see this question.
    Without precise information, it is impossible to say, we do not know how much this mat has been shortened, what its residual resistance has been, and how it has been insulated (cut-off point). The use of a resistor is theoretically possible, but probably not feasible.



    I know you can't, the question was whether you can put a resistor so that this piece does not explode
    how does it not report?
    mat 4mx0.5m 340 W, after cutting it is 1.7x0.5 and that's it :(

    pity, thanks for your help
  • #9 16612002
    kokapetyl
    Level 43  
    Posts: 13445
    Help: 1787
    Rate: 2102
    topolskia wrote:
    mat 4mx0.5m 340 W, after cutting it is 1.7x0.5 and that's it

    So fast, the mat has been reduced by 50%, the resistor should be 150-200W :D
    Forget about it, or follow the tips of your colleague kkas12
  • #10 16612005
    topolskia
    Level 10  
    Posts: 8
    kokapetyl wrote:
    topolskia wrote:
    mat 4mx0.5m 340 W, after cutting it is 1.7x0.5 and that's it

    So fast, the mat has been reduced by 50%, the resistor should be 150-200W :D


    https://www.piekarz.pl/pl/?group=487

    such? Link
    ] Link [/url]

  • Cutting the heating mat halves its resistance and doubles current

    #11 16612492
    polaklbn
    Level 24  
    Posts: 594
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    topolskia wrote:
    kokapetyl wrote:
    topolskia wrote:
    mat 4mx0.5m 340 W, after cutting it is 1.7x0.5 and that's it

    So fast, the mat has been reduced by 50%, the resistor should be 150-200W :D


    https://www.piekarz.pl/pl/?group=487

    such? Link
    ] Link [/url]

    Buddy, skip this search because you will kill someone ...
    I believe that the topic should be closed for the good of the author ...
    Remember Ohm's Law and think that a mat is such a resistor. Consider what will happen to the current in this circuit ...
  • #12 16612943
    topolskia
    Level 10  
    Posts: 8
    OK thank you
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Topic summary

LABEL_AI_GENERATED
The discussion revolves around a user who encountered issues after a heating mat was cut during a bathroom renovation. The original mat specifications were 340W and 155.5 Ohms, but after cutting, the user estimates the power is reduced to approximately 150W. Participants express concerns about the safety of connecting the shortened mat, emphasizing that cutting heating mats is not advisable due to the risk of reduced resistance leading to overheating or electrical hazards. Suggestions include the impracticality of using a resistor to mitigate the risks and the recommendation to replace the mat entirely. The conversation highlights the importance of proper installation and adherence to safety standards in electrical systems.
AI summary based on the discussion. May contain errors.
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